Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so safety is covered. The description adds real value by disclosing that each record carries a hash and a changed-since flag — an integrity/tamper-detection signal not in the annotations. It stops short of ordering, pagination, or scope (all periods vs current).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single front-loaded clause with no filler — the most important fact (every close) comes first. It is a sentence fragment with no verb, which makes it slightly cryptic at first read but wastes no space.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no parameters and no output schema, the description sensibly carries the return-shape burden by naming the fields an agent will get back. Missing only scope/ordering details, which are minor for a zero-arg read tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline 4 applies. The field list it does give is return-value context, not parameter semantics.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

"Every close" plus a list of the fields returned (through when, by whom, totals, hash, changed-since) makes it clear this enumerates close records with their detail. The resource is unambiguous, but there is no explicit verb (list/get) and no mention of gl_close_period or gl_changes, so an agent must infer it is a read-only enumeration rather than a close action.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No statement of when to call this versus gl_close_period (perform a close), gl_changes (what changed), or gl_checklist. The agent gets no routing signal at all beyond the name.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.